An orthopedic doctor is going to provide you with much better direction. They can assess your situation and provide you with recommended treatment. I would also seek out a trainer with experience with your condition.

Skip the chiropractor and get to a physical therapist. Take some time off from heavy spinal loads in the gym. There are really two phases to recovering from serious low-back injuries. Healing and regaining mobility. Take care of those and slowly work back into the spinal loads.

I've done most everything wrong along the way, but a PT at my church spent 8 weeks pro bono helping me out and I've been lifting with heavy spinal loads for almost a year now relatively pain free.